Part of the advantage of having a leader is that he/she could specialize in leading us and we could pay him/her a full-time salary. "Also, I feel like asking for a "leader" is the instinctive, un-narrow, halo-effect approach typically generated by the corrupted human hardware." Yes, but this is what works.

Please taboo "leading us". What is the actual job description for the leader you imagine? What is the expected outcome of having such leader?

And, depeding on your previous answer, could we achieve a similar outcome by simply having a specialist for given task? I mean, even actual leaders employ specialists, so why not skip the middleman? (Or do you believe that the leader would be better at finding the specialists? That sounds almost like a job description... of a specialist.)

Or is the leader supposed to be a symbol? A speaker for the movement?

Or perhaps a person who chooses an arbitrary goal (a meaningful one, but ultimately it would be an arbitrary choice among a few meaningful candidates) under the assumption that if we all focus on one goal, we are more likely to achieve it than if everyone follows a different goal (i.e. a suboptimal choice is still much better than no choice)?

I want someone who could effectively give orders/strong suggestions saying "give to this cause", "write to your congressman saying this", "if you have this skill please do this", "person A should help person B get this job", "person C is toxic and should be excluded from our community", "person D is fantastic, let's recruit her to our community", "everyone please read this and discuss", "person E is great, everyone thank her", "person F has made great contributions to our community but has suffered some recent bad news so let's help her out".

I just suspect there may be no person fit for this role and willing to take it, and that choosing an unfit person could be harmful. Essentially, people who are sufficiently sane and uncontroversial, are probably not interested in this role, because they believe they have better things to do. Otherwise, they could have already taken it.

All it would need at the beginning would be to privately ask other "rationalist celebrities" whether they think that X is a good idea and whether they are willing to endorse it publicly, and if they say yes, post X in the Main with the list of celebrities who endorse it. If the same person would do this 5 times in the row, people would automatically start accepting them as the leader. Most wouldn't notice if for the sixth time the endorsements from the other "rationalist celebrities" would be absent, as long as none of them opposes the post directly.